The Crab Nebula's gaseous filaments spread across the dark fabric of space. This nebula is all that remains of a star that blew up 6,500 light-years away—one of the closest supernovas known. Early astronomers first noticed the supernova in A.D.1054, when it glowed brightly enough to be seen during the day for several weeks. Much of the gas in this image is still pushing outward from the blast center, some of it at more than three million miles (five million kilometers) an hour.

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